Material measuring and dispensing machine



3 Sheets-Sheet l INV ENTOR Faber/[ea Goad/r7 BY M R. L. GOODIN FiledSept. 4, 1940 -MATERIAL MEASURING AND DISPENSING MACHINE March 3, 1942.

I March 3, 1942. R.'L. GOODIN MATERIAL MEASURING AND DISPENSING MACHINE3 Sheets-Sheet 2 Filed Sept. 4, 1940 ll lllwwll .miw I March 3, 1942. R.L. GOODIN MATERIAL MEASURING AND DISPENSING MACHINE Filed Sept. 4, 19403 Sheets-Sheet 5 INVENTOR Foer/[ee 600a? Patented Mar. 3, 1942 MATERIALMEASURING AND DISPENSING MACHINE Robert Lee Goodin, Oakland, Calif.

Application September 4, 1940, Serial No. 355,339

11 Claims.

The invention relates to machines which are adapted to automaticallymeasure out and dispense predetermined fixed amounts of material takenfrom a greater mass of the material.

An object of the invention is to provide a machine of the characterdescribed which will provide a rapid handling and accurate measuring anddispensing of a wide variety of material made up of solid particlesproviding a free flowing mass and having particle sizes up to andexceeding approximately threequarters of an inch.

Another object of the invention is to provide a machine of the characterdescribed which will carefully and safely handle various types ofmaterial and is especially adapted for use with fragile pieces orparticles of food stuff and the like, as for example rice, beans, peas,corn, popcorn, candy, nuts, etc.

A further object of the invention is to provide a machine of thecharacter above which will be adjustable to dispense a wide range ofmeasured quantities varying from a fraction of an ounce up to relativelylarge mass and volumetric quantities.

Still another object of the invention is to provide a machine of thecharacter described wherein the rate of discharge may be the control forthe filling of small containers without danger of clogging the machine.

Yet another object of the invention is to provide a machine of thecharacter set forth which is constructed of a relatively few number ofsturdily formed parts which are mounted and arranged to provide positiveoperation for a substantially indefinitely long period of active use.

The invention possesses other objects and features of advantage, some ofwhich, with the foregoing, will be set forth in the followingdescription of the preferred form. of the invention which is illustratedin the drawings accompanying and forming part of the specification. Itis to be understood, however, that variations in the showing made by thesaid drawing and description may be adopted within the scope of theinvention as set forth in the claims.

Referring to said drawings:

Figure 1 is a vertical sectional view of a machine constructed inaccordance with the present invention. 1

Figure 2 is a plan sectional view of the machine taken substantially onthe plane of line 2-2 of Figure 1.

Figure 3 is a cross-sectional view taken substantially on the plane ofline 3-3 of Figure 2.

Figure 4 is a cross-sectional view of the machine taken substantially onthe plane of line 4-4 of Figure 2.

Figure 5 is a Vertical sectional view taken substantially on the planeof line 5-5 of Figure 2.

Figure 6 is a side elevation of a part of the machine with a portionthereof cut away and shown in section.

With reference to the accompanying drawings, the measuring anddispensing machine therein depicted is assembled on a base or support 6,here fashioned in the form of a rectangular frame by a plurality ofangle iron and scrap members. Mounted on the top of the frame is a baseplate I having integrally formed upstanding longitudinally extendingside plates or walls 8 and 9 defining with the plate 1 a longitudinalchannel across the top and overhanging the opposite ends I I and I2 ofthe frame. Adjacent the right hand end I3 of the plate I, as viewed inFigures 1, 2 and 6, is a material discharge opening I4 which, as will beseen in Figures 1 and 6, is of elongated rectangular form. Mounted onthe side walls 8 and 9 to the left of the opening I4, as viewed inFigures 1 and 6, is a hopper I6 having downwardly converging side wallsI'I,, I8, I9 and 2I which terminate in an elongated rectangulardischarge opening 22 at the bottom end of the hopper.

A reciprocative member or carriage 23 is mounted within the elongatedchannel aforementioned and for longitudinal reciprocation therein and isprovided with a receiving chamber 24 which is adapted to move into andout of registration with the hopper opening 22 and the plate dischargeopening I4, so as to carry a measured quantity of material away from thehopper and adapted to deliver the same through the discharge opening I4.The carriage, as will be best seen from Figures 1, 3 and 4, consists ofa pair of upright side plates 26 and 2! which are held in spacedparallel relation by connecting end members28 and 29 and are mounted ina trough or depression 3! formed in the base plate I, so as to guide thelongitudinal movement of the carriage. As will be seen in Figure 4, theside plates 26 and 21 of the carriage directly underlie and form avertical continuation of the 1ongitudinal sides 32 and 33, the sides 32and 33 depending from the upper tapered hopper sides I8 and 2|. Mountedbetween the carriage side plates 26 and 2'! is an elongated invertedchannel member 34 having a closed top wall 36 and depending. side walls31 and 38 which are slidably mounted between the carriage walls 26, 21.The channel member 34 is closed at its right hand end, as viewed inFigure 1, by an end wall 39 and bevels downwardly and to the right fromthe top Wall 36 and defines the left hand side of the chamber 24aforementioned. The opposite longitudinal side of the chamber 24 isdefined by a plate 4! which extends transversely across the carriageside plates 26 and 21 and is pivoted on a transversely extending pin 42carried by these walls. The plate member 4| is normally held in asloping position, that is inclined downwardly and to the left as viewedin Figure 1, by means of a resilient connection made adjacent the upperend of the member. This connection is here effected by a pin 43 pivotedto the member 4| adjacent the upper end thereof and slidably carriedthrough an opening 44 in the end 29 of the carriage. A helical spring 46surrounding a part of the pin 43 is normally held in compression betweenthe member 29 and the remote end 41 of the pin, so as to hold the pinwith a shoulder 48 thereon engaged against the end member 29 and holdingthe chamber defining member 4| in inclined position as aforementioned.As the carriage 23 moves to the right, as shown in dotted lines inFigure 1, so as to carry the chamber 24 over the discharge opening l4,the outer end 41 of pin 43 is engaged by a stop member 49 on the end I3of the base plate 1 to cause the member 4| to rotate in acounterclockwise direction, thereby emptying the contents of the chamberthrough the opening I4. Preferably, the displacement of the member 4| issufficient to cause the same to assume a position substantially parallelto the opposite side 39 of the chamber.

As an important feature of the present construction, an improved form ofcut-off means is provided for stopping the flow of material into thechamber 24 as the same moves to the right out from under and inregistration with the hopper opening 22. As will be seen in Figure 1,this cut-off means consists of a pair of rollers and 52 which aremounted on the hopper and the carriage and which are engaged during thecut-off period so as to seal off the chamber 24 from the hopper opening52. The roller 5| is here mounted at the chamber side 39 and as will bebest seen from Figures 1 and 4, is carried on a central shaft 53journaled in openings in the side walls 31 and 38 of the carriage member34. A portion of the member 34 at the juncture of the top 36 and the endwall 39 is cut away so as to expose a portion of the periphery of theroller directly at the top end of the chamber. The roller 52 is carriedat the base of the forward end of the hopper opening and as here shown,this end is defined by a slide plate 54 reciprocally carried by thehopper wall l9. Normally the plate 54 is held by gravity and also bymeans of a spring 56 carried at the upper end of the plate, in adownward position so as to rest the roller 52 upon the top wall 36 ofthe member 34, the sliding support for the plate, however, permittingthe roller a yielding upward movement to permit passage of any particleslodged thereunder. It will thus be seen that as the chamber 24 moves outfrom under the hopper opening, the roller 5| which is on the followingor rearward side of the chamber, will engage the roller 52 on theforward end of the hopper opening so as to cut off the flow of materialentering the chamber.

As a further important feature of the cut-off mechanism, the rollers 5|and 52 are rotated to displace their peripheries away from the chamber24 preceding and during the cut-off period so as to displace particlesand pieces of the material engaged between the rollers, away from therollers and away from the chamber without injury to the particles. Meansfor so rotating the rollers is here in the form of a pair of racks 51and 58 which are mounted on the carriage and on the stationary supportrespectively and which engage pinions 59 and 6| carried by the rollershafts. As will be best seen from Figures 3 and 4, the rack 58 iscarried by the side plate 9 of the stationary support and engages thetop of the pinion 6| on roller 5| so as to cause this roller to rotatein a counter-clockwise direction as the carriage moves to the right, asviewed in Figure 1. The rack 51 is carried on arms 62 and 63 secured tothe side plate 26 of the carriage and the rack engages the top of pinion29 on roller 52, so as to cause this roller to rotate in a clockwisedirection upon movement of the carriage to the right, as viewed inFigure 1. It will thus be seen that as the rollers approach each otherwhile the carriage is moving to the right, as seen in Figure 1, therollers will serve to move the material away from the chamber and sealoff the top of the chamber at the point of cut-off while positivelypreventing any material from being caught or crushed between therollers.

On the return movement of the carriage, that is to the left as viewed inFigure 1, the rollers are rotated in a reverse direction and thusfunction to assist in the drawing of the material from the hopper intothe receiving chamber. This operation of the rollers and the relativelywide expanse of the chamber 24 at the top thereof ensures a rapidfilling of the chamber during the period of registration thereof withthe hopper opening.

In order to apply a constantly rotating force to the roller 52,regardless of its vertical position within the limits of verticalmovement permitted this roller, the rack 51 is supported to permitvertical movement thereof. As will be best seen in Figure 5, the arms 62and 63 are formed with forked upper ends defining a vertical slot,within which is mounted for vertical movement pins 64 and 66 fixed tothe rack 51. Normally, the rack is held in a downwardly pressed positionby means of a tension spring 61 which is connected at its upper end tothe rack and at its lower end to a pin 68 fixed to the side plate 26 ofthe carriage, see also Figure 3.

As an important feature of the present construction, the size of thechamber 24 may be readily varied over a relatively wide range so as toenable the machine to dispense various measured quantities of material.In the present construction the chamber size may be changed by adjustingthe longitudinal position of the inverted channel member 34 so as tocontrol the position of the chamber defining end 39 of this member.Means for so shifting the member 34 here consists of an elongated screwmember 69, see Figure 6, journaled adjacent its forward end 1| in abracket 12 on the carriage wall 21 and threaded through a member 13fixed to the wall 38 of the inverted channel member 34 and extendingthrough a longitudinal slot 14 in the carriage wall 21, see also Figure3. A suitable crank, not shown, may be fastened to the forward end 1| ofthe screw for rotating the same and longitudinally displacing theinverted channel member to a desired size of the chamber 24. It will benoted that in effecting this adjustment the operation of the roller 5|is left undisturbed by reason of the fact that this roller is mounted onand carried with the chamber 39. In order to hold the chamber in adesired adjusted position, I may look the screw 69 by means of lock nuts16 mounted on the screw against the bracket 12. In the smallest positionof the chamber, the chamber end 39 is drawn directly to the chamber endplate 4| and the chamber may be reduced to hold as little as a fractionof an ounce of material. On the other hand the chamber end 39 may bemoved to the left, as viewed in Figure 1, so as to enlarge the chamberto receive the entire capacity of the relatively large open hopper end.It will be seen that the chamber members 39 and 4|, particularly in thelarger positions of the chamber, cooperate with the bottom plate I todefine a chamber. For this reason the end 39 of the member 34 isextended down to and rests upon the plate 1 so as to move any and allmaterial resting on the plate into the discharge opening l4 Preferably,the transverse sides of the end members 39 and 4| are provided withupstanding shoulder or ear portions I! which bevel into the chamber andeffectively wipe the material off from the transverse sides of thechamber, as defined by the carriage sides 26 and 21.

Mounted under the discharge opening I4 is a discharge chute 18 for thematerial to be dispensed and as will be seen from Figure 1, this chuteis provided with a downwardly and outwardly inclined bottom wall 19which cooperates with opposed side walls 8| to guide material depositedtherein to a discharge opening 82 provided in the outer end wall 83 ofthe chute. Preferably and as here shown, the chute is supported on theend wall [2 of the frame support 6 so as to be entirely independent ofthe upper member 1 for its support. As an important feature of thepresent construction, I mount in the bottom wall 19 of the chute aroller 84 which is pivotally supported on an axis at substantially rightangles to the direction of flow of the material and has the upperportion of its periphery exposed within the chute. This roller isadapted to be poweroperated and rotated to displace the upper peripherythereof in the'direction of flow so as to agitate the materialbeingdischarged and to urge the same in the direction of the dischargeopening 82. Preferably, the roller is non-circular in cross section soas to better agitate and move the material, the form here shown beingthe one with a series of longitudinally extending circumferentiallyspaced grooves or corrugations 89. Also preferably, I provide adjacentthe discharge end 82 of the chute an adjustable gate 81 which may be setto control the discharge area of the chute so as to limit the rate ofdischarge of material leaving the chute. This is particularly desirablewhere material is being filled into relatively small bags having alimited input flow capacity. In such case the gate is adjusted to holdback the material to prevent a choking up of the bag and the chute. Whenrelatively large quantities of material are being dumped into large bagsor other containers which can quickly take off the amount of materialbeing dumped, the discharge gate may be moved to its upper position soas to present little or no obstruction to the free discharge of thematerial. As here shown, the gate 81 may be adjusted by means of a wingnut 88 threaded onto a pin carried by the gate and extending through anelongated slot 89 in the end plate 83. Where material is being filledinto relatively small mouthed containers, I prefer to fasten on thedischarge end of the hopper a reducer member 9| which as here shown, isformed with an enlarged end which may be telescopically secured on theprotruding walls forming discharge opening 82 of the chute.

The drive means for reciprocating the carriage and for rotating theroller 84 in the discharge chute is in the present construction underfull manual control so that the rate of movement of the carriage and therate of discharge may be controlled by the operator. The source of powerfor driving the several parts is here obtained by an electric motor 92mounted in the base frame l2. The motor drive shaft 93 is connected byway of suitable reduction gears contained in the gear box 94, and amanually operated clutch, to a crank arm 96. The rotary movement of thelatter is converted into a reciprocal movement of the carriage by meansof a connecting rod 91 connecting the crank arm 96 to a link 98 which ispivoted at its lower end to the base of the supporting frame and itsupper end is pivotally and slidably carried in a lug 99 depending fromthe end 28 of the carriage. The lug 99 is formed with a downwardlyopening vertical slot I!!! which receives a pin I02 on the bifurcatedupper end 193 of the link 98, the arrangement providing for theaforementioned pivoted and sliding movement and in addition enablingready dis-association of the link from the lug by lifting off of the topframe members I. By reason of this latter feature and also by reason ofthe independent support of the discharge chute from the upper structureof the machine, the top plate I and the carriage and the hopper may bereadily removed and replaced as a unit. As here shown, the upper plate Iis detachably held in place at the top of the base frame by means of aplural ity of depending pins I94 on the plate I which engage throughappropriately positioned openings in the top of the frame. In thismanner larger and smaller units may be assembled on a single base framesupport, thereby giving the machine a very much wider capacity andimproved ability to handle various materials.

The opposite end of motor drive shaft 93 is connected by way of suitablereduction gears N15 to the roller 84 in the discharge chute whereby thislatter roller is directly driven by the motor. Preferably, an operatingshaft I01 for the clutch aforementioned is extended forwardly toadjacent the discharge chute and provided with a lever I98 on itsforward end for convenient operation by the operator. Preferably, thelever I99 is arranged as here shown at the same side of the machine asthe discharge chute, so that the operator by displacing the lever maycause a movement of the carriage to discharge material as frequently oras often as the operator is able to place a bag or other container inregistration with the discharge end of the chute.

I claim:

1. A volumetric measuring machine comprising, a hopper for material tobe measured out and having a discharge opening, a reciprocative membermounted for movement across said opening and provided with a receivingchamber of predetermined volume positioned to move in one direction ofmovement of said member into registration with said opening and in anopposite direction of movement of said member out of registration withsaid opening, during said last named movement the forward wall of saidopening cooperating with therearward wall of chamber to cut oil the flowof material from said opening into said chamber, and rollers carried bysaid member and said hopper adjacent said walls and engaged as thechamber is moved out of registration with said opening to cut oil thematerial flow.

2. A volumetric measuring machine comprising, a hopper for material tobe measured out and having an open bottom end, a carriage mounted formovement across the open [bottom end of said hopper and provided with achamber for receipt of said material and positioned to move into and outof registration with said hopper end, and material cut-off meanscomprising a roller mounted on said hopper end, a roller on saidcarriage adapted to move across the underside of said first roller andin engagement therewith upon passing of said chamber out of registrationwith said hopper end, and means rotating said rollers in reversedirections with their adjacent peripheries moving away from said chamberduring period of cut-off of said chamber and hopper end.

3. A volumetric measuring machine comprising, a hopper for material tobe measured out and having ah open bottom end, a carriage mounted formovement across the open bottom end of said hopper provided with achamber for receipt of said material and positioned to: move into andout of registration with said hopper end, and material cut-off meanscomprising a roller mounted on said hopper end and supported to permitvertical movement thereof, a roller on said carriage at said chamberadapted to move across the under-side of and engage said first rollerupon passing of said chamber out of registration with said hopper end,and means rotating said rollers in reverse directions with their adjacent peripheries moving away from said chamber during period of cut-oiTof said chamber and hopper end.

4. A measuring and dispensing machine of the character describedcomprising a support, a hopper for material to be measured and dispensedcarried by said support and having an open bottom end for gravitation ofmaterial therefrom, a member mounted for reciprocal movement under andacross the open discharge end of said hopper and provided with a chamberfor receipt of said material, said chamber being positioned to move intoand out of registration with said hopper end, said hopper end having awall portion arranged across the line of movement of said member forcutting off the flow of material into said chamber, said wall portionbeing vertically displaceable, a roller carried at the lower edge or"said wall portion and across the line of movement of said member andmovable vertically with said wall portion, spring means normally holdingsaid wall portion and roller in a lowered position adjacent the top ofsaid memx chamber, said means providing a rotation of said rollers withtheir adjacent peripheries moving.

away from said chamber so as to displace material away from the rollersduring said period of cut-off.

5. A measuring and dispensing machine of the character describedcomprising a support, a hopper for material to be measured and dispensedcarried by said support and having an open bottom end for gravitation ofmaterial therefrom, a member mounted for reciprocal movement under andacross the open discharge end of said hopper and provided with a chamberfor receipt of said material, said chamber being positioned to move intoand out of registration with said hopper end, a roller carried at saidhopper end and across the line of movement of said member, a rollercarried by said member at substantially right angles to the line ofmovement thereof and across the rearward edge of said chamber andpositioned to engage the under-side of said first roller to cut off theflow of material from said hopper end into said chamber upon movement ofsaid chamber out of registration with said hopper end, and means forrotating said rollers during course of movement of said member androtating said rollers to displace the adjacent pe ripheries thereof awayfrom said chamber during period of movement of said member out ofregistration so as to displace said material away from said chamberduring period of cut-off and rotating said rollers in a reversedirection during period of movement into registration so as to drawmaterial into said chamber.

6. A measuring and dispensing machine of the character describedcomprising a support, a hopper for material to be measured and dispensedcarried by said support and having an open bottom end for gravitation ofmaterial therefrom, a member mounted for reciprocal movement under andacross the open discharge end of said hopper and provided with a chamberfor receipt of said material, said chamber being positioned to move intoand out of registration with said hopper end, said hopper end having awall portion arranged across the line of movement of said member forcutting off the flow of material into said chamber, said wall portionbeing Vertically displaceable, a roller carried at the lower edge ofsaid wall portion and across the line of movement of said member andmovable vertically with said wall portion, spring means normally holdingsaid wall portion and roller in a lowered position adjacent the top ofsaid member,

-a roller carried by said member at substantially right angles to theline of movement thereof and across the rearward edge of said chamberand positioned to engage the under-side of said first roller to cut offthe flow of material from said hopper end into said chamber uponmovement of said chamber out of registration with said hopper end,pinions carried by said rollers, a rack carried by said support andengageable with said member roller pinion, and a rack carried by saidmember and engageable with said hopper roller pinion, said racks beingpositioned to rotate said rollers in reverse directions during movementof said member and displacing the adjacent peripheries of said rollersaway from said chamber during the cut-off period and rotating saidrollers in an opposite direction during movement of said chamber intoregistration with said hopper end.

'7. A measuring and dispensing machine of the character describedcomprising a support, a hopper for material to be measured and dispensedcarried by said support and having an open bottom end for gravitation ofmaterial therefrom, a member mounted for reciprocal movement under andacross the open discharge end of said hopper and provided with a chamberfor receipt of said material, said chamber being positioned to move intoand out of registration with said hopper end, said hopper end having awall portion arranged across the line of movement of said member forcutting off the flow of material into said chamber, said wall portionbeing vertically displaceable, a roller carried at the lower edge ofsaid wall portion and across the line of movement of said member andmovable Vertically with said wall portion, spring means normally holdingsaid wall portion and roller in a lowered position adjacent the top ofsaid member and mounted for vertical movement to and from said member, aroller carried by said member at substantially right angles to the lineof movement thereof and across the rearward edge of said chamber andpositioned to engage the under-side of said first roller to cut off theflow of material from said hopper end into said chamber upon movement ofsaid chamber out of registration with said hopper end, pinions carriedby said rollers, a rack carried by said support and engageable with saidmember roller pinion, and a rack carried by said member and engageablewith said hopper roller pinion, said racks being positioned to rotatesaid rollers in reverse directions during movement of said member anddisplacing the adjacent peripheries of said rollers away from saidchamber during the cut-off period and rotating said rollers in anopposite direction during movement of said chamber into registrationwith said hopper end, said second named rack being pivoted to permitvertical oscillation thereof to maintain constant engagementwith saidhopper roller pinion during vertical movement of said hopper roller.

8. A volumetric measuring machine comprising, a hopper for material tobe measured out and having a discharge opening, a reciprocative membermounted for movement across said opening and provided with a receivingchamber of predetermined volume to move in one direction of movement ofsaid member into registration with said opening and in an oppositedirection of movement of said member out of registration with saidopening, during said last named movement the forward wall of saidopening cooperating with the rearward wall of said chamber to cut offthe flow of material from said opening into said chamber, rollerscarried by said member and said hopper adjacent said walls and engagedas the chamber is moved out of registration with said opening to cut oilthe material flow, and means for adjusting the spacing between saidchamber wall and an opposite chamber wall to regulate and control thevolume of said chamber.

9. A material measuring and dispensing machine comprising, a hopper formaterial having an elongated substantially rectangular discharge openingin the bottom thereof, an elongated carriage mounted for movement undersaid discharge opening and having a base and a pair of vertical sidewalls substantially engaged with and forming a vertical continuation ofthe elongated sides of said opening, an inverted channel shaped memberincluding a top and depending sides mounted between said walls andhaving a closed end sloping from adjacent said top to said base, amember mounted across said carriage side walls and longitudinally spacedfrom said member end to define therebetween and with said base areceiving chamber adapted to be moved upon reciprocation of saidcarriage into and out of registration with said opening, a rollercarried by said first member at the top of said closed end and arrangedacross the line of movement of said carriage, a roller carried by an endwall of said opening across the line of movement of said carriage andengaged by said first roller upon movement of said chamber out ofregistration with said opening, and means for rotating said rollersduring movement of said carriage to displace the adjacent peripheries ofsaid rollers away from said chamber during movement of the latter out ofregistration and to displace said roller peripheries towards saidchamber upon movement of said chamber into registration.

10. A material measuring and dispensing machine comprising, a hopper formaterial having an elongated substantially rectangular discharge openingin the bottom thereof, an elongated carriage mounted for movement undersaid discharge opening and having a base and a pair of vertical sidewalls substantially engaged with and forming a vertical continuation ofthe elongated sides of said opening, an inverted channel shaped memberincluding a top and depending sides mounted between said walls andhaving a closed end sloping from adjacent said top to said base, amember mounted across said carriage side walls and longitudinally spacedfrom said member end to definetherebetween and with said base areceiving chamber adapted to be moved upon reciprocation of saidcarriage into and out of registration with said opening, a rollercarried by said first member at the top of said closed end and arrangedacross the line of movement of said carriage, a roller carried by an endwall of said opening across the line of movement of said carriage andengaged by said first roller upon movement of said chamber out ofregistration with said opening, means for rotating said rollers duringmovement of said carriage to displace the adjacent peripheries of saidrollers away from said chamber during movement of the latter out ofregistration and to displace said roller peripheries towards saidchamber upon movement of said chamber into registration, and means fordisplacing said inverted channel member relative to said carriage tochange the size of said chamber.

11. A material measuring and dispensing machine comprising, a supportincluding an elongated plate having a discharge opening and a hoppermounted above said plate and having an open discharge end spacedlongitudinally from said opening, an elongated longitudinallyreciprocative member mounted on said plate under said hopper end andprovided with longitudinally spaced transversely extending upwardlydivergent walls defining a receiving chamber, means for displacing saidmember to move said chamber from a position in registration with saidhopper end to a position over said opening, the leading wall of saidchamber during said movement being pivoted for rotation about ahorizontal transverse axis to discharge the contents of said chamberthrough said opening, and means automatically rotating said last namedwall upon movement of said chamber over said opening.

ROBERT LEE GOODIN.

